Plot Summary

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Inspector Tellini investigates serial crimes where victims are paralyzed while having their bellies ripped open with a sharp knife, much in the same way tarantulas are killed by the black wasp. As suspects keep dying, Inspector directs his attention to a spa all the victims had a connection with.

When nymphomaniac Maria Zani is murdered, her ex-husband and insurance broker Paolo Zani becomes the prime-suspect of Inspector Tellini. Then the saleswoman Mirta Ricci is murdered in the same modus operandi - both victims had been paralyzed by acupuncture needles with poison introduced in their necks and their bellies had been ripped open with a knife with the victims still alive, in the same way that tarantulas are killed by tarantula hawks. The police find that she was also a drug dealer, Paolo meets Inspector Tellini to tell him that he is innocent. Further, he hires the private eyes La Catapulta that finds the last man that had met Maria, the photographer Mario. Paolo pursues Mario but they both die and Inspector Tellini finds an envelope addressed to Franca Valentino with Mario. Inspector Tellini discovers that he was a blackmailer and meanwhile Franca becomes the third victim of the serial killer. When the masseuse Jenny is found dead wrapped in plastic bag, Inspector Tellini goes to the massage parlor to meet the manager Laura and he believes that an employee may be the serial-killer.